emacs.c

早期freebsd实现

/* Fully extensible Emacs, running on Unix, intended for GNU.
   Copyright (C) 1985, 1986, 1987, 1990 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


#include <signal.h>
#include <errno.h>

#include "config.h"
#include <stdio.h>
#undef NULL
#include "lisp.h"
#include "commands.h"

#include <sys/types.h>
#include <sys/file.h>

#ifdef VMS
#include <ssdef.h>
#endif

#ifdef USG5
#include <fcntl.h>
#endif

#ifdef BSD
#include <sys/ioctl.h>
#endif

#ifdef APOLLO
#ifndef APOLLO_SR10
#include <default_acl.h>
#endif
#endif

#ifndef O_RDWR
#define O_RDWR 2
#endif

#define PRIO_PROCESS 0

/* Command line args from shell, as list of strings */
Lisp_Object Vcommand_line_args;

/* Hook run by `kill-emacs' before it does really anything.  */
Lisp_Object Vkill_emacs_hook;

/* Set nonzero after Emacs has started up the first time.
  Prevents reinitialization of the Lisp world and keymaps
  on subsequent starts.  */
int initialized;

/* Variable whose value is symbol giving operating system type */
Lisp_Object Vsystem_type;
  
/* If non-zero, emacs should not attempt to use an window-specific code,
   but instead should use the virtual terminal under which it was started */
int inhibit_window_system;

#ifdef HAVE_X_WINDOWS
/* If -d option is used, this variable points to the name of
   the display to use.  */
char *alternate_display;
char **xargv;
int xargc;
#endif /* HAVE_X_WINDOWS */

#ifdef USG_SHARED_LIBRARIES
/* If nonzero, this is the place to put the end of the writable segment
   at startup.  */

unsigned int bss_end = 0;
#endif

/* Nonzero means running Emacs without interactive terminal.  */

int noninteractive;

/* Value of Lisp variable `noninteractive'.
   Normally same as C variable `noninteractive'
   but nothing terrible happens if user sets this one.  */

int noninteractive1;

/* Signal code for the fatal signal that was received */
int fatal_error_code;

/* Nonzero if handling a fatal error already */
int fatal_error_in_progress;

/* Handle bus errors, illegal instruction, etc. */
fatal_error_signal (sig)
     int sig;
{
#ifdef BSD
  int tpgrp;
#endif /* BSD */

  fatal_error_code = sig;
  signal (sig, SIG_DFL);

  /* If fatal error occurs in code below, avoid infinite recursion.  */
  if (fatal_error_in_progress)
    kill (getpid (), fatal_error_code);

  fatal_error_in_progress = 1;

  /* If we are controlling the terminal, reset terminal modes */
#ifdef BSD
  if (ioctl(0, TIOCGPGRP, &tpgrp) == 0
      && tpgrp == getpgrp (0))
#endif /* BSD */
    {
      reset_sys_modes ();
      if (sig != SIGTERM)
	fprintf (stderr, "Fatal error (%d).", sig);
    }

  /* Clean up */
#ifdef subprocesses
  kill_buffer_processes (Qnil);
#endif
  Fdo_auto_save (Qt);

#ifdef CLASH_DETECTION
  unlock_all_files ();
#endif /* CLASH_DETECTION */

#ifdef VMS
  kill_vms_processes ();
  LIB$STOP (SS$_ABORT);
#else
  /* Signal the same code; this time it will really be fatal.  */
  kill (getpid (), fatal_error_code);
#endif /* not VMS */
}

/* Code for dealing with Lisp access to the Unix command line */

static
init_cmdargs (argc, argv, skip_args)
     int argc;
     char **argv;
     int skip_args;
{
  register int i;

  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
	Vcommand_line_args
	  = Fcons (build_string (argv[i]), Vcommand_line_args);
    }
}

#ifdef VMS
#ifdef LINK_CRTL_SHARE
#ifdef SHAREABLE_LIB_BUG
extern noshare char **environ;
#endif /* SHAREABLE_LIB_BUG */
#endif /* LINK_CRTL_SHARE */
#endif /* VMS */

/* We don't include crtbegin.o and crtend.o in the link,
   so these functions and variables might be missed.
   Provide dummy definitions to avoid error.
   (We don't have any real constructors or destructors.)  */
#ifdef __GNUC__
#ifndef ORDINARY_LINK
__do_clobal_ctors ()
{}
__do_clobal_ctors_aux ()
{}
__do_global_dtors ()
{}
char * __CTOR_LIST__[2] = { (char *) (-1), 0 };
char * __DTOR_LIST__[2] = { (char *) (-1), 0 };
__main ()
{}
#endif /* not ORDINARY_LINK */
#endif /* __GNUC__ */

/* ARGSUSED */
main (argc, argv, envp)
     int argc;
     char **argv;
     char **envp;
{
  int skip_args = 0;
  extern int errno;
  extern void malloc_warning ();

/* Map in shared memory, if we are using that.  */
#ifdef HAVE_SHM
  if (argc > 1 && !strcmp (argv[1], "-nl"))
    {
      map_in_data (0);
      /* The shared momory was just restored, which clobbered this.  */
      skip_args = 1;
    }
  else
    {
      map_in_data (1);
      /* The shared momory was just restored, which clobbered this.  */
      skip_args = 0;
    }
#endif

#ifdef VMS
  /* If -map specified, map the data file in */
  if (argc > 2 && ! strcmp (argv[1], "-map"))
    {
      skip_args = 2;
      mapin_data (argv[2]);
    }

#ifdef LINK_CRTL_SHARE
#ifdef SHAREABLE_LIB_BUG
  /* Bletcherous shared libraries! */
  if (!stdin)
    stdin = fdopen (0, "r");
  if (!stdout)
    stdout = fdopen (1, "w");
  if (!stderr)
    stderr = fdopen (2, "w");
  if (!environ)
    environ = envp;
#endif /* SHAREABLE_LIB_BUG */
#endif /* LINK_CRTL_SHARE */
#endif /* VMS */

#ifdef USG_SHARED_LIBRARIES
  if (bss_end)
    brk (bss_end);
#endif

  clearerr (stdin);

#ifdef APOLLO
#ifndef APOLLO_SR10
  /* If USE_DOMAIN_ACLS environment variable exists,
     use ACLs rather than UNIX modes. */
  if (egetenv ("USE_DOMAIN_ACLS"))
    default_acl (USE_DEFACL);
#endif
#endif /* APOLLO */

#ifndef SYSTEM_MALLOC
  /* Arrange for warnings when nearly out of space.  */
  malloc_init (0, malloc_warning);
#endif

#ifdef HIGHPRI
  setpriority (PRIO_PROCESS, getpid (), HIGHPRI);
  setuid (getuid ());
#endif HIGHPRI

  inhibit_window_system = 0;

#ifdef HAVE_X_WINDOWS
  xargv = argv;
  xargc = argc;
#endif

/* Handle the -t switch, which specifies filename to use as terminal */
  if (skip_args + 2 < argc && !strcmp (argv[skip_args + 1], "-t"))
    {
      skip_args += 2;
      close (0);
      close (1);
      open (argv[skip_args], O_RDWR, 2 );
      dup (0);
      fprintf (stderr, "Using %s\n", argv[skip_args]);
#ifdef HAVE_X_WINDOWS
      inhibit_window_system = 1;	/* -t => -nw */
#endif
    }
#ifdef HAVE_X_WINDOWS
/* Handle the -d switch, which means use a different display for X */
  if (skip_args + 2 < argc && (!strcmp (argv[skip_args + 1], "-d") ||
			       !strcmp (argv[skip_args + 1], "-display")))
    {
      skip_args += 2;
      alternate_display = argv[skip_args];
    } 
  else
    alternate_display = 0;
#endif	/* HAVE_X_WINDOWS */

  if (skip_args + 1 < argc
      && (!strcmp (argv[skip_args + 1], "-nw")))
    {
      skip_args += 1;
      inhibit_window_system = 1;
    }

/* Handle the -batch switch, which means don't do interactive display.  */
  noninteractive = 0;
  if (skip_args + 1 < argc && !strcmp (argv[skip_args + 1], "-batch"))
    {
      skip_args += 1;
      noninteractive = 1;
    }

  if (
#ifndef CANNOT_DUMP
      ! noninteractive || initialized
#else
      1
#endif
      )
    {
      /* Don't catch these signals in batch mode if not initialized.
	 On some machines, this sets static data that would make
	 signal fail to work right when the dumped Emacs is run.  */
      signal (SIGHUP, fatal_error_signal);
      signal (SIGQUIT, fatal_error_signal);
      signal (SIGILL, fatal_error_signal);
      signal (SIGTRAP, fatal_error_signal);
      signal (SIGIOT, fatal_error_signal);
#ifdef SIGEMT
      signal (SIGEMT, fatal_error_signal);
#endif
      signal (SIGFPE, fatal_error_signal);
      signal (SIGBUS, fatal_error_signal);
      signal (SIGSEGV, fatal_error_signal);
      signal (SIGSYS, fatal_error_signal);
      signal (SIGTERM, fatal_error_signal);
#ifdef SIGXCPU
      signal (SIGXCPU, fatal_error_signal);
#endif
#ifdef SIGXFSZ
      signal (SIGXFSZ, fatal_error_signal);
#endif SIGXFSZ

#ifdef AIX
      signal (SIGDANGER, fatal_error_signal);
      signal (20, fatal_error_signal);
      signal (21, fatal_error_signal);
      signal (22, fatal_error_signal);